TATRA STB-637 series, a pump-action shotgun with own characteristics, is a successful and extremely reliable clone of Ithaca model 37.

It is known for its novel combination ejection/loading port on the bottom of the shotgun that leaves the sides closed to the elements; since shells load and eject from the bottom, operation of the gun is equally convenient for both right-handed and left-handed shooters. This allows user shoot either 2″, 3/4″ or 3″ shells.

Its barrel, made of 4140 drilled steel is chrome-plated inside, and outside immersed in phosphate. The receiver is machined from forged steel, which provides tremendous durability even under the most difficult pressure and operating conditions.

The model, which is highly preferred by law enforcement, is for the use in both civilian and military markets.